Composite magnetic material prepared by compression forming of ferrite-coated metal particles and method for preparation thereof
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
Feb 9, 2004
filing date -
Aug 9, 2001
priority date (Note) -
Abandoned
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Abstract
Fine ferromagnetic metal or intermetallic compound particles having a ferrite layer covering formed on the surface thereof are compression-formed to form a composite of the ferrite layer and the metal or intermetallic compound, thereby configuring a composite magnetic material which has the fine ferromagnetic metal or intermetallic compound particles electrically insulated from one another and magnetically connected to one another and exhibits a high saturation magnetization, high permeability and also high insulating property. The ferrite layer covering is preferably formed by ferrite plating, and particularly by ferrite plating with the aid of ultrasonic excitation. This composite magnetic material is provided with higher insulating property as the fine ferromagnetic particles and ultra-fine ferrite particles are mixed and compression-formed to form a composite. The ferrite layer preferably has an amorphous ferrite phase as a primary phase.
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